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Focal Reducer DO-GSO 0.5x 2"
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Unisend LV
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1.99 €
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The Focal Reducer DO-GSO 0.5x 2" is an optical accessory designed for telescopes to decrease the focal length and increase the field of view. This device helps astronomers and stargazers capture wider celestial vistas and reduce exposure times during imaging sessions, making it a valuable addition to both visual observations and astrophotography setups.
By effectively halving the focal length of the telescope, this focal reducer significantly broadens the visible area of the night sky, allowing users to observe large deep-sky objects such as extended nebulae and large galaxies in a single frame. Additionally, shortening the focal length increases the optical system speed, which helps reduce necessary photographic exposure times. The 2-inch barrel size ensures compatibility with standard telescope focusers and accessories, providing a stable and reliable optical connection for various setups.
This optical accessory is generally not recommended for high-magnification planetary or lunar observations, where a longer focal length and narrow field of view are typically preferred. Furthermore, users should note that focal reducers can introduce optical aberrations or vignetting at the edges of the field of view when used with certain telescope designs or large sensor formats.
To use the Focal Reducer DO-GSO 0.5x 2", insert the 2-inch barrel directly into the telescope focuser or visual back and secure it firmly. Attach your camera or eyepiece to the rear thread or adapter of the reducer. Ensure that the optical train is properly spaced, as distance affects the actual reduction factor and optical performance. Adjust the telescope focus until a sharp image is achieved across the expanded field of view.
Always store the focal reducer in a dry, dust-free environment with protective caps attached when not in use, and clean optical surfaces only with specialized lens cleaning materials to prevent damage to the coatings.
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This product page focuses on the Focal Reducer DO-GSO 0.5x 2", which is compared with alternative optical telescope accessories including the DO-GSO Plossl 20mm and 15mm eyepieces, the DO-GSO 2.5x 1.25" Barlow lens, the DO-GSO 2-inch coma corrector, and the DO-GSO SCT 90° 2" star diagonal. All these items belong to the category of astronomical optical accessories, but they serve fundamentally different functions. While the Focal Reducer DO-GSO 0.5x 2" decreases focal length and increases the field of view, the alternatives either increase magnification, correct optical aberrations, or change the viewing angle.
⚙️ The specifications table below compares the product type, barrel diameter, and primary optical purpose of the items.
| Comparison parameter | Focal Reducer DO-GSO 0.5x 2" | DO-GSO Plossl 20mm 1.25-inch | DO-GSO Plossl 15mm 1.25-inch | DO-GSO 2.5x 1.25" Barlow lens | Coma corrector DO-GSO 2-inch | DO-GSO SCT 90° 2" Star Diagonal | Practical significance |
|---|---|---|---|---|---|---|---|
| Accessory type | Focal reducer | Eyepiece | Eyepiece | Barlow lens | Coma corrector | Star diagonal | Defines the fundamental way the accessory interacts with the telescope optical train. |
| Barrel size | 2" | 1.25" | 1.25" | 1.25" | 2" | 2" | Determines physical compatibility with the telescope focuser and other optical parts. |
| Primary purpose | Decreases focal length and increases field of view | Provides moderate magnification for general celestial viewing | Provides higher magnification for detailed target observation | Multiplies eyepiece magnification by 2.5x | Eliminates optical aberrations (coma) at the edge of the frame | Provides a comfortable 90° viewing angle | Each accessory fulfills a distinct astronomical requirement and they are complementary rather than interchangeable. |
◎ The suitability table below evaluates which product is best suited for specific use cases and observational needs.
| Use case | Recommended product | Why |
|---|---|---|
| Wide-field astrophotography and shorter exposure times | Focal Reducer DO-GSO 0.5x 2" | Specifically built to capture wider celestial vistas and reduce photographic exposure times. |
| Comfortable visual observation of the Moon and planets | DO-GSO Plossl 20mm 1.25-inch | Delivers clear, sharp views with a comfortable viewing experience for general stargazing. |
| Boosting magnification range for detailed planetary viewing | DO-GSO 2.5x 1.25" Barlow lens | Allows users to achieve higher magnification steps using their existing eyepieces. |
| Eliminating edge distortions in Newtonian telescopes | Coma corrector DO-GSO 2-inch | Corrects edge aberrations to maintain high-contrast clarity across the entire astrophotography frame. |
The Focal Reducer DO-GSO 0.5x 2" differs fundamentally from the compared eyepieces, Barlow lenses, coma correctors, and star diagonals by focusing on expanding the field of view and reducing exposure time rather than increasing magnification or changing light paths. It is most suitable for astrophotography enthusiasts and wide-field observers, whereas the alternative products serve entirely different observational goals.
